Discovering Anthuriums : Floristics of Section Polyneurium of Carchi Province
Project outline • This study of the Araceae in Carchi Province will contribute to our understanding of ecology of Ecuador. • It will also be a direct benefit to the completion of the Araceae treatment for the Flora of Ecuador. Anthurium pulverlentum Sodiro in its natural habitat.
MBG Mentor • Dr. Tom B. Croat • Taxonomist, a Teacher, and a world traveler. • Worked at the garden for 47 years.
The Flora of Ecuador • Ecuador lies in the heart of the tropics on both sides of the equator. • With warm tempature and wet climate makes it fit among the richest areas on earth for the study of Araceae. Map of Ecuador
Carchi Province • Carchí is one of Ecuador’s twenty - four provinces • It is seated in the northwest corner of Ecuador, straddling the Andes and bordering Colombia. • The Andes holds one of the most diverse Araceae habitats world wide.
Ecuador
Araceae • The Araceae are a family with approximately 125 genera and about 3750 species. • Araceae flowers are borne on a type of inflorescence called a spadix, sometimes partially enclosed in a spathe or leaf-like bract. • Also known as the arum family, members are often colloquially known as aroids.
Anthurium Schott • The genus Anthurium is the largest genus in the family. • 950 species listed, 2000 expected • There are 18 sections within the genus Anthurium . • Native to Central and Anthurium andreanum Linden , popular in the cut flower industry. Originally South America. from the Andes.
Anthurium Schott • The first system of subgeneric classification was that of H. W. Schott published in 1860, in which he classified Anthurium into 28 sections. • A more recent revision of the genus by Engler (1905) the species are divided into 18 sections • Then later by Croat & Scheffer (1983)
Section Polyneurium Schott • The focus of our study concentrated on Section Polyneurium, which ranges from Nicaragua to the mountains of western Venezuela and Peru. • The section Polyneurium has approximately 160 species. A. urbanii Sodiro
Section Polyneurium • It is suspected by Dr. Croat that the Polyneurium Section Polyneurium could represent more than one element and is formed of two distinct groups. Group 1 Group 2 A . cuspidatum A. corrugatum
Section Polyneurium Group 1 • Shown here by its green spadix. • Leaf blade longer than broad. • Petioles typically shorter than the blades. A. cuspidatum Mast.
• Many closely spaced primary lateral veins Long posterior lobes A. cuspidatum Mast.
Section Polyneurium Group 2 • Closer spaced veins, often cordate blades, wider than long. • Red spadices. A. corrugatum Sodiro
Methods for describing • Group specimens based on like features. • Morphometric analysis of specimen(s). • Character analysis in Lucid Anthurium key. • Compare specimen (s) with most similar species. Carchi Specimens at the herbarium
Characters Sinus Measurement of • Sinus- depth, width, shape. • Midrib- whether it was convex or concave, smooth or rough. • Posterior & Anterior Lobe- length, width. • # of Primary lateral Anthurium morphology diagram veins, angle of departure .
• When a new leaf blade forms it initially is enclosed by a sheath like structure called a cataphyll. • Whether or not this feature persisted or was Cataphyll deciduous was often a notable feature.
• Minute punctuation dot the underside of the leaf are only present on in select species. Anthurium longipeltatum
Characters (surfaces) Surfaces were often an important feature, here showing a bullate texture. A. toisanense --- Lower surface A. toisanense --- Upper surface
Characters Tepals (Inflorescence) • Count number of florets per spiral. • Measure tepals width. • These floral character are crucial for determining speciation. Close up of florets
Characters • The posterior rib is often used in species delineation. • This is an example of coalesced basal veins. Posterior rib of A. debile-emarginatum
Characters • Another example of a vastly different posterior rib where the basal veins are free to the base and have almost no coalescence. A. maldonadoense Croat
Characters • Another example of Basal veins not coalesced A. (#5) Posterior rib/basal veins under 3x magnification.
Characters • This is the surface showing a smoother texture with some speckling A. gualpii under 3x magnification under a dissecting scope.
A. elisalevyae • One the largest and the first species I described. • Named after Elisa Levy, a local student who went with Dr. Croat on the 2012 Carchi Expedition.
A. mikemadisonii (#5) • One of the unnamed species. • Species that were “unnamed” were given a tentative title to help separate them from the other specimens. • This is one of the smaller plants. Size varies as one can tell.
List of Species described Anthurium aciculare Anthurium longicaudatum Anthurium alluriquinense Anthurium melanochlorum Anthurium atrinsperum Anthurium misturatum Anthurium bernalii Anthurium multinervium Anthurium boylei Anthurium oreophilum Anthurium carinatum Anthurium panduriforme Anthurium chuchubiense Anthurium pseudonigrescens Anthurium dalmauii Anthurium pulverulentum Anthurium debili- Anthurium rivulare emarginatum Anthurium testaceum Anthurium elisalevyae Anthurium tipazii Anth. graciliacuminatum Anthurium toisanense Anthurium guelpiae Anthurium umbraculum Anth. hebetatilaminum Anthurium urbanii Anthurium lineolatum A. #3,4,6
Lucid Anthurium Key • The Lucid Key consists of an electronic identification and diagnostic key. It allows Lucid keys to be published across the Internet or a shared network. • The Lucid “Anthurium Key” is managed by Steve Aylward and Susan McQueen and is shared among the other interns and Dr. Croat’s volunteers and is constantly being updated.
Lucid multichotomous key
Making a dichotomous key • After finishing descriptions we began working on creating a key. • Dr. Croat and I would select what we believed to be key characters of each species, then chose distinguishing feature based on those characters. Dr. Croat in his natural habitat.
Results 40 Anthuriums of Carchi 35 • We are saying that there is 30 35 species newly found in 25 Carchi, 12 of which were previously undescribed 20 with 4 of those 12 being 15 sterile (lacking 10 inflorescences) and 5 therefore unable to 0 determine true speciation. • Polyneurium’s being the largest section being represented in the Carchi region.
• Future Work Future work Exploration into Colombia and other areas of the montane wet forest of Ecuador could most likely deliver more new species of Anthuriums.
Thanks every one! • Dr. Thomas B. Croat • Carla Kostelac • David Bogler • Mary McNamara • My fellow REU’ers • Steve Aylward • Emily the aroid caretaker • Mary Merello • All the MOBOT staff • NSF
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